氧气与氩气等离子体对树脂基托表面改性的对比研究

目的：对比氧气等离子体与氩气等离子体对聚甲基丙烯酸甲酯[poly（methyl methacrylate），PMMA]表面改性效果。方法：将聚甲基丙烯酸甲酯基托材料制成2 mm ×10 mm ×10 mm的试件24块，对照组、氧气等离子体与氩气等离子体处理组各8块，其中2块作 X射线光电子能谱分析，6块作表面接触角测定。实验组标本采用氧气或氩气等离子体处理，接触角测量液为二次重蒸蒸馏水，液滴经微量进样器排出，每个标本在不同部位测量5次取平均值，采用 SPSS 20．0软件对数据进行单因素方差分析。结果：氧气等离子体处理组的PMMA表面代表C -O结构的峰值最高，其次为氩气等离子体处理组，最低为对照组。表面 O/C 原子比，分别从0．289升至0．682和0．593。表面接触角分别从66．32°降至41．35°和46．16°。结论：氧气等离子体和氩气等离子体表面处理后，聚甲基丙烯酸甲酯表面氧原子含量增加，表面润湿性改善，氧气等离子体表面处理效果优于氩气等离子体。

Comparison between O2-plasma and Ar-plasma treatment effects on PMMA

Objective：To compare the changes of chemical components and contact angles on the surface of PMMA after O2-plasma and Ar-plasma treatment.Methods：24 test specimens were prepared from an acrylic resin denture material.The specimens were placed in a glass tubular reactor.Imposition of 60 W of power created the condition under which plasma treatment was carried out for 2 min.X-ray photoelectron spectroscopy（XPS）studies and contact angle measurements were performed.Results：After O2-plasma and Ar-plasma treatment,the O/C atomic ratios increased from 0.289 to 0.682 and 0.593.Contact angles were reduced from 66.32°to 41 .35°and 46.1 6°respectively.Conclusions：Within the limitations of this study,both O2-plasma and Ar-plasma treatment have effect on increas-ing the amount of oxygen atoms and improving wettability of PMMA.But,the effect of O2-plasma was better than that of Ar-plasma.